public void pressEvaluateButton(id sender)
{
try
{
var eval = new Evaluator();
edValue.text = "" + eval.Evaluate(edValue.text);
}
catch (EvaluatorError e)
{
var alert = UIAlertController.alertControllerWithTitle("Calculator!") message("Error evaluation: " + e.reason) preferredStyle(UIAlertControllerStyle.Alert);
presentViewController(alert) animated(true) completion(null);
}
}